Development of Optical Disk Memories with a High Reflectance Using Metal Island Films

本研究的目的是利用纳米尺寸的金属团簇组成的金属岛膜，开发具有高反射率和光变化大的光盘存储器。适合做光盘的金属是银和铜。我们选取了银岛薄膜，并对其记录特性进行了研究。在800nm波长处，由于岛的热变形，银岛膜的光学性质发生了很大的变化。我们首次用原子力显微镜（AFM）对其进行了实验证实。我们也见过激光书写的记录速度约为1毫秒。此外，埋藏在含氟橡胶中的银岛膜被证实是非常稳定的。因此，我们认为银岛薄膜是一种非常有用的光盘存储介质。

The purpose of this study is to develop the optical disk memories with a high reflectance and great optical change by using metal island films composed of nanometer-size metal clusters. The suitable metals for optical disks are silver and copper. We have selected the silver island films and have investigated its recording characteristics. The optical properties of the silver island film can be greatly changed at the wavelength of 800 nm by heating due to the thermal deformation of islands. We have experimentally confirmed it by using an atomic force microscopy (AFM) for the first time. We have also seen the laser writing at the recording speed of about 1 mus. In addition, the silver island films buried in fluorine-contained rubber is confirmed to be very stable. Therefore we conclude that the silver island films are very useful media for optical disk memories.